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Switch off the phone, remove the memory card and boot again without the memory card. Now try accessing the camera, hope it's working now. I would suggest you to scan the memory card or format it (i recommend formatting the memory card so that it'll not fail).
If the problem persists even without the memory card, reset your phone's settings to Factory Default by going to the Settings > Restore Factory (open the settings, press up key once, you'll see the "Restore Factory") using the code 12345. Your phone will automatically restart. Now try again with camera.

If both the above methods don't help out, your only option is to flash the phone or update the firmware. But I don't recommend do these yourself, a small mistake or incomplete will damage the phone or will create more problems. You can visit any service center or any mobile repairing center and get it done with a small fee.

set your messages in messaging - options- settings - other to 999 and e memory.

restore factory settings *#7780# default code is 12345 that might just might help you a bit and turn off and on your phone when you do all these things see if it helps any.

“Memory Full…Close some applications and try again” is a normalmessage that usually comes on Nokia N70. It showed the memory used in the phone doesn’t have space anymore. But if the message still appears although the user already closed some applications it can be theproblem.Someone who experience in this memory full problem said, an error message of memory full like above is appears each time he’s opened theCamera. It also happens for a few times when he’s trying to openmessages, Gallery, or other applications. And then it will force to restart the phone.Seems like it’s a RAM problem and might there are some applications unable to close completely. If your Nokia N70 phone has gone a startmenu button you can try to hold it down. This way will show youeverything that you have open and they can be closed easily so thatyou can continue to take your photos.So if it can resolve the problem you can reset/format by pressing *#7370#

Try turnin the camera to the side where gravity will help pop open the disc and be careful not be keeping it close with your own hand. Its a thin cover and you can accidently be holding it close without knowing.